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4q25 microdeletion encompassing PITX2: A patient presenting with tetralogy of Fallot and dental anomalies without ocular features.

Abstract：

:Axenfeld-Rieger syndrome (ARS) is a heterogeneous clinical entity transmitted in an autosomal dominant manner. The main feature, Axenfeld-Rieger Anomaly (ARA), is a malformation of the anterior segment of the eye that can lead to glaucoma and impair vision. Extra-ocular defects have also been reported. Point mutations of FOXC1 and PITX2 are responsible for about 40% of the ARS cases. We describe the phenotype of a patient carrying a deletion encompassing the 4q25 locus containing PITX2 gene. This child presented with a congenital heart defect (Tetralogy of Fallot, TOF) and no signs of ARA. He is the first patient described with TOF and a complete deletion of PITX2 (arr[GRCh37]4q25(110843057-112077858)x1, involving PITX2, EGF, ELOVL6 and ENPEP) inherited from his ARS affected mother. In addition, to our knowledge, he is the first patient reported with no ocular phenotype associated with haploinsufficiency of PITX2. We compare the phenotype and genotype of this patient to those of five other patients carrying 4q25 deletions. Two of these patients were enrolled in the university hospital in Toulouse, while the other three were already documented in DECIPHER. This comparative study suggests both an incomplete penetrance of the ocular malformation pattern in patients carrying PITX2 deletions and a putative association between TOF and PITX2 haploinsufficiency.

journal_name

Eur J Med Genet

journal_title

European journal of medical genetics

authors

Vande Perre P,Zazo Seco C,Patat O,Bouneau L,Vigouroux A,Bourgeois D,El Hout S,Chassaing N,Calvas P

doi

10.1016/j.ejmg.2017.10.018

subject

Has Abstract

pub_date

2018-02-01 00:00:00

pages

72-78

issue

2

eissn

1769-7212

issn

1878-0849

pii

S1769-7212(17)30149-0

journal_volume

61

pub_type

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